{Reference Type}: Journal Article {Title}: Microbiota alert: Proteobacteria consume arginine to dampen omental antitumor immunity. {Author}: Du X;Jie Z;Zou Q; {Journal}: Cell Host Microbe {Volume}: 32 {Issue}: 7 {Year}: 2024 Jul 10 {Factor}: 31.316 {DOI}: 10.1016/j.chom.2024.05.020 {Abstract}: The microbiota can impact antitumor immunity, but whether the microbiota regulates omental antitumor immunity remains elusive. In this issue of Cell Host & Microbe, Meza-Perez et al. demonstrated that Proteobacteria consume arginine to increase Treg cell suppressive capacity and inhibit antitumor immune responses, promoting tumor growth in the omentum.